The couple, who are rumoured to be engaged, are eager to start a family together as the Snow Patrol pianist has bonded with the actress' nine-year-old daughter Coco, her child from her previous marriage to David Arquette.

The pair think it would be great to give a disadvantaged youngster a new life and give Coco a sister.

A source told Life & Style Weekly magazine: ''Courteney proposed the idea of adopting a child to Johnny after their family vacation to Italy in February. And Johnny is all for it. He's in love with the idea of growing a family with her.''

Courteney, 49, and Johnny, 37, sparked speculation they are engaged after the former 'Friends' star was spotted wearing a huge diamond ring on her engagement finger as she strolled through Los Angeles International Airport (LAX) earlier this month.